Drawing-board.



PATENTED JULY 3, 1906.

E. WERNER.

DRAWING BOARD.

APPLICATION FILED nu 18,1905.

2 SHEETS-SHEET 1.

No. 324,956. PATRNTRD JULY s, 190s. R. WRRNRR. DRAWING BOARD.

APPLICATION FILED MAY 18,1905.

2 SHEETS-SHEET 2.

UNITED' STATES PATENT-ormon- EMIL WERNER, orfiriiigianiirirnia, PitiinsrLvANiA.

fvaewmeeee-nika'centeo iu'ii/ 3, 1906.

Application ma M y ia montani No. 260,996. i

.To all whom it may concern.-

Be it known that I, EMIL WERNER', a' citi-' Zen of the United States, residing in thecit)T and county of Philadel hia, State of Pennsylvania, have invente a new and useful Drawing-Board, of which the following is a specification.

My invention consists of a drawing-board adapted to be rotated and a square placed over the .face of said board adapted to be particularly set f respectively, on line z z and Fig. 1 Fig-g 6 represents a erspective View, on an enlarged scale, of t e means employed for movably retaining the square emplo ed in position. Fig. 7 represents a vertica section, on an enlarged scale, of the means employedl for supporting a drawing en or pencil. Fig. 8 represents a section on ine y y', Fig. 3, on an enlarged scale. Figs. 9 and 10 are diagrams lof some of the work produced. Fig.

toothe 11 represents a side elevation of a detached portion on an enlar ed scale.

Similar letters o reference indicate corresponding parts in the figures.

Referring to the drawings, A designates a circular drawin -board, the same being centrally mounted y the pivot B on the base or frame C. The peripheral portion of the under side of said board A- is beveled, as at D, the same being adapted to rotate on the friction-rollers E,which are properlyT mounted on the frame C, whereby the board is erly sustained on its peripheral portion''nd steadied in its operation.

The (periphery of the board has thereon the rim F, presenting the three hundred and sierty degrees of a circle, and either of the same is adapted to be engaged b the detent G, which is connected with an carried by the spring H, the latter being securedat one end of the frame C, and has its 'other end is a so secured to said frame C, so as to hold the detent G from the riml F, thus permitting adapted to be engaged by the latch J, which V.ro-tation-ofthe:bo-ard A it being noticed that whei'ilthe spring is drawnout it bears against the inclined nose of the bolt f said latch J thus forcing back. said bolt. Then when the spring clears said nose the bolt shoots out to its normal .position and then engages withthe inner side of said spring, thus controlling the latter, lwhereby the detent `is held disengaged from the rim F. When the 'board has been turnedto the required extent, the latch l is withdrawn, whereby the detent G, owing to the spring H, is forced .into contact with the relative tooth-oi said rim F, when the board l will be firmlyheldvat rest.

On the sides of the frame C are the graduated rules K, which are tangential to the eriphery of the board A. Extending para lel With the rules K are the'tongues L, which are secured to the frame C and have engaged therewith the head M of a, T-square N, it being noticed that said head has a groove to receive said tongue, as' most-clearly shown in Fig. 2, whereby the square may be moved true on the'f'rame C and steadied in its motions.

In order to retain the square in said tongues L, I' employ the. spring P, Wliichis secured to the limb Q, which depends from said head M '(seeFi 6) and has its ends bearing against the'uner side of either of the tongues L, thus retaining said head in position on said tongue,

-while permit'ting'free sliding motions of the head, and consequentlyA of the T-sqiare, over the board. Y

A sheet or iece of aper or other material .is placed on t e boar A beneath the square N and the latter shifted up or down to a place for starting a drawing or delineation of a eometric figure, a design, a pattern, &c. he mark is made on the sheet to the required extent along the limb of the square, as a ruler, when the boardV is rotated so as to bring another portion of the sheet up to said drawing or delineation, wheny another mark is made on the sheet, and so the board ma be rotated and the square shifted while t e marking continues, and thus an angular ii ure, &c., may be completed, an example o which is shown in Fig; 9, where several other designs a's roduced are illustrated.

n order to delineate or mark off circular forms, which are shown in Fig. 10, as at a, I employ the arm R, which is sustained over the drawing-board and T-square by means of thepostS, secured to the socket T, the latter rising from `the frame C and having the screw Ufo'r holding` said post in vertically-adjusted IIO screw V, which is adapted to engage the outer end ofthe. arml R, an d' thus hold the latter in longitudinally-adjusted position. The free4 end of said arm isad apted to have connected therewith a p apen, the same contactdrawn and rotating theA boardAsaidcjirc aybe delineated. Other circles may bedrawnon the paper by means of a circle-describing; instrument, as the pencil vor pen W, one leg ofi which is adapted to pivota ly rest on airec'essXin the foot Y on the scribin'g-pinZ, thelfa'tter'being reversibly secured tov the'free,enr'lr'ofl the armR. Said 1nstrument-maydescribe and delineate cir- I cles b, as willbe seen on reference t'o Fig. 10.

The scribing-point of the pin Z may be laced. below, -as in Fig. 11, while in Fig. 3 the oot Y 1s below for the purpose hereinbefore stated.l In order to prevent improper rotation of the arm R on the pointS, the face of said arm is flattened, as at R', so that the screw Vi'nay be firmly engagedfwith lthe same, the effect of which'is evidentg While I have shown the rules, such as K, on the frame C at each side of the board A,it 1s evident that theT-square N may be placed on either side of the device and operated from the same, if so desired; b ut one of said rules and tongues may be dispensed with, they, however, being preferred, as the square may be readily shifted from one side to the other, for purposes requiring the same, and entirely removed.

As means for retaining the Ipivot B ofthe board A in position, the same is passed through thc plate freely within the board B on the under side of the board A, its head beingl above said Cplate, and the shank of said pivot and engages with a threaded sleeve B2 on the frame C, it being noticed that said pivot has a slit or nick in its lower end, so that by meansv of a proper implement said pivot may be rotated from below, so as to a'dgust the same and provide the proper friction on thehead of the same.

Referring to the right-hand side of F ig. 2, thev tongue L is below the top of the side of the board, forming the shoulder L', againstv which may be .placed and on which may be moved the headl of an ordinary T-square board, so that by B rlatively to the diame.-

I claim as new, and desire to secure by Let- Without being engaged with said tongue, as shown at the left-hand side of said figure. Various changes `vmay be made in the details of construction shown without. departing from the general spirit of my invention, andl ldo not, therefore, desire to be limited in each case to the same.

Having thus described my invention, what ters Patent, is-

.1. A rotatable drawing-board, abase therefor, va late on the under side of said board, a threa ed-sleeve in the base, and a screw having its head freely confined in a recess in the under side of the board and above the plate, said screw being engaged in said sleeve and its lower end having a slit to permit of its being turned from below to regulate `the friction on the head of the same and the ease of rotation of said board.

2. A rotatable drawing-board having teeth on its periphery in accordance with degrees of a circle, Ja detent for engaging any of said teeth to lock the board, a resilient carrier for said detent, and a movable device movable inthe direction of the length of said carrier tol engage the end of said carrier upon either side to hold the detent in or out of engagement with said teeth. 1

3. A drawing-board, a tongue at the side thereof adapted for engagement'of a grooved T-square, the said tongue being below the top of said board forming a shoulder at said side for engagement of the head of an ordilnary'square and a grooved T-square having a portion underlying said tongue.

4. A drawing-board, a support therefor, a

tongue at the side of said support, a square, a

pendent limb on said square underlying said tongue, and a pressure device interposed between said limb and tongue;

' '5. A drawing-board, a support, an arm on said support adapted to overhang said board and a vertically-adjustable piece connectible with said arm, said piece having at one end a pin for scribing, the other end being provided with a foot having a seat thereon for the leg of a circle-describing instrument.

EMIL WERNER.

Vlitnesses:

.JOHN A. VVIEDERSHEIM,

S. R. CARR. 

